package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        // 根据code，appid，secret调用微信接口服务获取openid
        String openid = getOpenid(userLoginDTO.getCode());
        // 判断获取到的openid是否为空，如果为空则登录失败，抛出异常
        if (openid == null || openid.isEmpty()){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        // 在数据库中查询openid判断当前用户是否为新用户，如果是新用户，自动完成注册
        User user = userMapper.getByOpenid(openid);
        if (user == null){
            // 新用户，自动注册
            user = User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);
        }
        // 返回这个用户
        return user;
    }

    /**
     * 调用微信接口服务，获取openid
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        Map<String, String> paramMap = new HashMap<>();
        paramMap.put("appid", weChatProperties.getAppid());
        paramMap.put("secret", weChatProperties.getSecret());
        paramMap.put("js_code", code);
        paramMap.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN_URL, paramMap);
        JSONObject jsonObject = JSON.parseObject(json);
        return jsonObject.getString("openid");
    }


}
